Focus Cards
A grid that spotlights one card at a time: pointing at or keyboard-focusing a card keeps it sharp while every sibling dims and blurs. Real list semantics — `ul` › `li` › `article` — and a controlled or uncontrolled active index.
Preview
Rendered from the story the storybook (a11y) CI gate runs axe against — the preview can't show something that hasn't been verified.
Install
Two equivalent paths — the URL works in any shadcn-CLI setup; the alias works once you've registered @interlace in your components.json.
npx shadcn@latest add https://ds.interlace.tools/r/focus-cards.jsonnpx shadcn@latest add @interlace/focus-cardsBehavior
What this component does — the keyboard path, the measured colour, the text equivalent and the states it can be in. Every figure below is read out of the test or the source that enforces it by scripts/build-behavior-map.mjs, so nothing here can outlive the gate that keeps it true.
Measured contrast
packages/ui/__tests__/theme-contract-lock.test.ts ↗Every semantic colour pair this component's own source uses, measured against the shipped hexes in all 4 theme × scheme combinations. The tightest is ring on background at 8.39:1 (harbor · light), against a floor of 3:1.
| Pair | interlacelight | interlacedark | harborlight | harbordark | Floor |
|---|---|---|---|---|---|
| ring on backgroundfocus ring (SC 2.4.13) | 8.80:1 | 11.79:1 | 8.39:1 | 10.03:1 | 3.0:1SC 1.4.11 |
| ring on cardfocus ring inside a card | 8.80:1 | 10.92:1 | 8.86:1 | 9.10:1 | 3.0:1SC 1.4.11 |
Text pairs are held to 4.5:1 (WCAG 2.2 SC 1.4.3); borders, rings and chart axes to 3:1 (SC 1.4.11 non-text). Bold is the worst cell in the row — the one a brand fork has to keep an eye on.
Runtime contract
packages/ui/vitest.config.ts ↗Where it renders, how narrow it survives, and whether its lines are inside the coverage gate — three answers a consumer needs before the paste, not after the bug.
- Render boundary
'use client'Hydrates. It brings JavaScript to any route that imports it — put the boundary here, not at the page.
- Minimum viewport
none declaredNo width floor: it takes the width it is given. Its container owns the layout question.
- Coverage gate
not in the gateThe 100% gate currently covers
src/charts/**/*.{ts,tsx}andsrc/lib/**/*.{ts,tsx}andsrc/primitives/{button-variants,data-state-model,meter-scale,skeleton-variants}.tsandsrc/primitives/{alert,aspect-ratio,avatar,badge,box,breadcrumb,button,callout,card,checkbox,container,data-state,focus-ring,grade-badge,grid,input,label,meter,pagination,published-date,reading-time,section,section-boundary,separator,skip-link,stack,stat-strip,tag,textarea,typography,visually-hidden}.tsx. This file is outside it — the glob widens in phase 7.2.
History
This component is at v1.2.0, first shipped in @interlace/ui 1.0.0. The version is stamped as a banner into the file the install writes, so the copy in your tree says which one you have — compare it with the number above before deciding whether to re-run the install.
No release note names this component yet. It shipped with the release above and has not changed since — see the full changelog for what moved elsewhere in the DS.
Import
2 named exports — pull the parts you need.
import { FocusCard, FocusCards } from '@/components/ui/aceternity/focus-cards';Anatomy
Extracted from the primitive's JSDoc header. The source is the only documentation that can't drift.
FocusCards (ul — data-slot="focus-cards")
└─ li (data-slot="focus-cards-item",
group/focus-item, data-active/data-dimmed,
owns the pointer + focus handlers)
└─ FocusCard (article — data-slot="focus-card")
├─ div (data-slot="focus-card-media")
└─ div (data-slot="focus-card-caption")
The active/dim state travels down as `group-data-[active]/focus-item` and
`group-data-[dimmed]/focus-item` CSS, so `renderItem` never forwards a prop
for it. `FocusCard`'s own `active` / `dimmed` props exist only for composing
a card outside the grid.API reference
Parsed from the type declarations in the source — the same file the install writes into your tree, so this table can't drift from the component you get.
FocusCardProps
| Prop | Type | Description |
|---|---|---|
| caption | ReactNode | Caption shown over the media when the card is active. Slot (`ReactNode`), not a string, so consumers can compose a title + description, a link, an icon row, etc. Omit for a media-only card. |
| children | ReactNode | The card media — typically an image or `next/image`, but any node works (video, canvas, gradient). The component never assumes an image element, so there is no app- or framework-specific media policy baked in. |
| active | boolean | Force the active (sharp, caption-visible) state regardless of the parent grid. Inside {@link FocusCards} the active/dim state flows automatically from the grid via CSS, so leave this unset there; pass it only when composing a `FocusCard` standalone. @default false |
| dimmed | boolean | Force the dimmed (blurred, receded) state regardless of the parent grid. Like {@link FocusCardProps.active}, only needed for standalone composition. @default false |
FocusCardsProps
| Prop | Type | Description |
|---|---|---|
| items* | readonly TItem[] | Data for each card. The component is data-shape agnostic: provide any array and render each entry via {@link FocusCardsProps.renderItem}. Keys come from {@link FocusCardsProps.getItemKey} (falls back to the index). |
| renderItem* | (item: TItem, index: number, active: boolean) => ReactNode | Render one card from an item. Return a {@link FocusCard} (recommended) so the active/dim styling applies, or any node for full control. Receives the item, its index, and whether it is currently active. |
| getItemKey | (item: TItem, index: number) => React.Key | Derive a stable React key for an item. Defaults to the array index, which is only safe for a static, non-reordered list — supply this whenever the list can reorder or items can be inserted/removed. @default (_, index) => index |
| activeIndex | number | null | Controlled active card index, or `null` for "none active". Pair with {@link FocusCardsProps.onActiveChange}. Leave undefined to run uncontrolled via {@link FocusCardsProps.defaultActiveIndex}. |
| defaultActiveIndex | number | null | Initial active card index for uncontrolled usage. @default null |
| columns | 1 | 2 | 3 | 4 | Called when the active card changes, with the new index (or `null`) and the reason it changed. Noun-first per the DS event convention. / onActiveChange?: ( index: number | null, details: FocusCardsChangeDetails, ) => void; /** Number of columns at the largest breakpoint. Mobile is always a single column; the grid steps up to this count at `md`. Clamped to 1–4 because the responsive ladder only defines tokens up to four columns. @default 3 |
Accessibility
Every story for this component is rendered headlessly and checked with axe-core (wcag2aa, wcag22aa, best-practice, ACT) on every PR. That gate has no continue-on-error, so what ships has zero known violations.
What follows is what static analysis can see. Axe cannot press a key and never sees an overlay open, so the operable-without-a-mouse claim lives in Behavior instead, where the keyboard path is replayed step by step.
- Focus + keyboard behaviour
- Native element semantics — no interaction layer to get wrong.
- Focus ring (WCAG 2.2 SC 2.4.13)
- Not focusable — no focus indicator required.
- Reduced motion
- Animation is gated on prefers-reduced-motion.
- ARIA in the source
- None — semantics come from the element or the Base UI primitive rather than hand-written ARIA.
Examples
2 more states from the same story file.
Dependencies
- Base UI primitive
- Native / no Base UI dependency
- Lucide icons
- none
- NPM dependencies
- none
- Registry dependencies
Source
The full implementation — components/ui/aceternity/focus-cards.tsx once installed.
"use client";
import {
type ComponentPropsWithoutRef,
type ReactNode,
useCallback,
useState,
} from "react";
// @interlace/focus-cards v1.2.0 — Interlace design system.
// Docs, props and live preview: https://ds.interlace.tools/c/focus-cards
// What changed since: https://ds.interlace.tools/c/focus-cards#history
// Generated banner — keep it, the upgrade diff reads this version.
/**
* @interlace/ui — FocusCards + FocusCard
*
* A grid that spotlights one card at a time: pointing at or keyboard-focusing
* a card keeps it sharp while every sibling dims and blurs. Real list
* semantics — `ul` › `li` › `article` — and a controlled or uncontrolled
…359 more lines…Registry JSON
The raw registry record — what the shadcn CLI fetches.